US5773138A - Advanced compatible polymer wood fiber composite - Google Patents
Advanced compatible polymer wood fiber composite Download PDFInfo
- Publication number
- US5773138A US5773138A US08/779,685 US77968597A US5773138A US 5773138 A US5773138 A US 5773138A US 77968597 A US77968597 A US 77968597A US 5773138 A US5773138 A US 5773138A
- Authority
- US
- United States
- Prior art keywords
- polymer
- pellet
- fiber
- wood fiber
- wood
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 239000002025 wood fiber Substances 0.000 title claims abstract description 64
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- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000012764 mineral filler Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- VIJMMQUAJQEELS-UHFFFAOYSA-N n,n-bis(ethenyl)ethenamine Chemical compound C=CN(C=C)C=C VIJMMQUAJQEELS-UHFFFAOYSA-N 0.000 description 1
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
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- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- SBOJXQVPLKSXOG-UHFFFAOYSA-N o-amino-hydroxylamine Chemical compound NON SBOJXQVPLKSXOG-UHFFFAOYSA-N 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
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- 229920000620 organic polymer Polymers 0.000 description 1
- 150000002924 oxiranes Chemical class 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
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- 229920003023 plastic Polymers 0.000 description 1
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- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
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- 229920001610 polycaprolactone Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- VNNBZUFJRRODHO-UHFFFAOYSA-N prop-2-enenitrile;prop-1-en-2-ylbenzene Chemical compound C=CC#N.CC(=C)C1=CC=CC=C1 VNNBZUFJRRODHO-UHFFFAOYSA-N 0.000 description 1
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 239000012070 reactive reagent Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002990 reinforced plastic Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
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- 239000010936 titanium Substances 0.000 description 1
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- 239000004408 titanium dioxide Substances 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/007—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and at least partly composed of recycled material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/28—Moulding or pressing characterised by using extrusion presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/12—Making granules characterised by structure or composition
- B29B9/14—Making granules characterised by structure or composition fibre-reinforced
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/045—Reinforcing macromolecular compounds with loose or coherent fibrous material with vegetable or animal fibrous material
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2311/00—Use of natural products or their composites, not provided for in groups B29K2201/00 - B29K2309/00, as reinforcement
- B29K2311/14—Wood, e.g. woodboard or fibreboard
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08J2327/06—Homopolymers or copolymers of vinyl chloride
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/02—Cellulose; Modified cellulose
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/253—Cellulosic [e.g., wood, paper, cork, rayon, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/2904—Staple length fiber
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/2907—Staple length fiber with coating or impregnation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2933—Coated or with bond, impregnation or core
- Y10T428/2938—Coating on discrete and individual rods, strands or filaments
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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- Y10T428/2933—Coated or with bond, impregnation or core
- Y10T428/2964—Artificial fiber or filament
- Y10T428/2965—Cellulosic
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
- Y10T428/31591—Next to cellulosic
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/31725—Of polyamide
- Y10T428/31779—Next to cellulosic
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/31725—Of polyamide
- Y10T428/31779—Next to cellulosic
- Y10T428/31783—Paper or wood
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/3188—Next to cellulosic
Definitions
- the invention relates to compatible composite thermoplastic materials used for the fabrication of structural members.
- the thermoplastic materials comprise a continuous phase of polyvinyl chloride having a discontinuous phase of a cellulosic fiber.
- the composite material is maintained thermoplastic throughout its useful life by avoiding the use of any substantial concentration of crosslinking agents that would either crosslink cellulosic fibers, polymer molecules or cellulosic fiber to polymer.
- the physical properties of the thermoplastic material are improved by increasing polymer-fiber compatibility, i.e. the tendency of the polymer and fiber to mix.
- the improved mixing tendencies improves the coatability of the fiber by polymer, increases the degree the polymer wets the fiber in the melt stage and substantially increases the engineering properties of the materials as a whole.
- the improved engineering properties include increased tensile strength when compared to immodified materials (without a compatibilizing composition).
- the improved engineering properties permit the manufacture of improved structural members.
- Such members can be any structural unit.
- the members are for use in windows and doors for residential and commercial architecture.
- the invention relates to an improved composite material adapted to extrusion or injection molding processes for forming structural members that have improved properties when used in windows and doors.
- the composite materials of the invention can be made to manufacture structural components such as rails, jambs, stiles, sills, tracks, stop and sash, nonstructural trim elements such as grid, cove, bead, quarter round, etc.
- Conventional window and door manufacture has commonly used wood and metal components in forming structural members.
- residential windows are manufactured from milled wood products that are assembled with glass to form typically double hung or casement units.
- Wood windows while structurally sound, useful and well adapted for use in many residential installations, can deteriorate under certain circumstances. Wood windows also require painting and other periodic maintenance. Wooden windows also suffer from cost problems related to the availability of suitable wood for construction. Clear wood products are slowly becoming more scarce and are becoming more expensive as demand increases.
- Metal components are often combined with glass and formed into single unit sliding windows. Metal windows typically suffer from substantial energy loss during winter months.
- thermoplastic materials have been used in window and door manufacture. Filled and unfilled thermoplastics have been extruded into useful seals, trim, weatherstripping, coatings and other window construction components.
- Thermoplastic materials such as polyvinyl chloride have been combined with wood members in manufacturing PERMASHIELD® brand windows manufactured by Andersen Corporation for many years.
- the technology disclosed in Zanini, U.S. Pat. Nos. 2,926,729 and 3,432,883 have been utilized in the manufacturing of plastic coatings or envelopes on wooden or other structural members.
- the cladding or coating technology used in making PERMASHIELD® windows involves extruding a thin polyvinyl chloride coating or envelope surrounding a wooden structural member.
- thermoplastic material that provides engineering properties for structural members and for applications in window and door manufacture.
- thermoplastic composite materials have become an important part of commercial manufacture of window and door components. While these materials are sufficiently strong for most structural components used in window and door manufacture, certain components require added stiffness, tensile strength, elongation at break or other engineering property not always provided by the materials disclosed in Puppin et al.
- thermoplastic materials in the continuous polymer phase we have examined the modification of thermoplastic materials in the continuous polymer phase, the modification of the cellulosic materials in the discontinuous cellulosic phase for improving the structural polymers of these composite materials.
- the prior art has recognized that certain advantages can be obtained by a judicious modification of the materials.
- a number of additives are known for use in both thermoplastic and cellulosic materials including molding lubricants, polymer stabilizers, pigments, coatings, etc.
- U.S. Pat. No. 3,943,079 teaches subjecting unregenerated cellulose fiber to a shearing force resulting in mixing minor proportions of a polymer and a lubricant material with the fiber. Such processing improves fiber separation and prevents agglomeration. The processing with the effects of the lubricant tends to enhance receptiveness of the fiber to the polymer reducing the time required for mixing.
- Coran et al. U.S. Pat. No.
- 4,414,267 teaches a treatment of fiber with an aqueous dispersion of a vinyl chloride polymer and a plasticizer, the resulting fibers contain a coating of polyvinyl chloride and plasticizer and can be incorporated into the polymer matrix with reduced mixing energy.
- Beshay, U.S. Pat. Nos. 4,717,742 and 4,820,749 teach a composite material containing a cellulose having grafted silane groups.
- Raj et al., U.S. Pat. No. 5,120,776 teach cellulosic fibers pretreated with maleic or phthalic anhydride to improve the bonding and dispersibility of the fiber in the polymer matrix.
- Raj et al. teach a high density polyethylene chemical treated pulp composite.
- 5,153,241 teaches composite materials including a modified cellulose.
- the cellulose is modified with an organo titanium coupling agent which reacts with and reinforces the polymer phase.
- the modification of the thermoplastic is also suggested in metal polypropylene laminates, crystallinity of polypropylene has been modified with an unsaturated carboxylic acid or derivative thereof. Such materials are known to be used in composite formation.
- thermoplastic composite material that can be made of polymer and wood fiber with an optional, intentional recycle of a waste stream.
- This need requires a thermoplastic composite with creep resistance, improved heat distortion temperature having a coefficient of thermal expansion that approximates wood, a material that can be extruded into reproducible stable dimensions, a high compressive strength, a low thermal transmission rate, an improved resistance to insect attack and rot while in use and a hardness and rigidity that permits sawing, milling, and fastening retention comparable to wood members.
- modified polymer indicates a polymeric material having side groups or moieties deliberately introduced onto the polymer backbone or copolymerized into the polymer backbone that increase the tendency of the polymer to associate with or wet the fiber surface. Typically, such modifications introduce pendant groups onto the polymer that form hydrogen bonds with the cellulosic material.
- the cellulose can be modified or derivatized.
- derivatized or modified cellulose for purposes of this invention include reacting the cellulose with a reagent that forms a derivative on either a primary or secondary hydroxyl of the cellulosic material.
- the hydroxyl reactive reagent contains a substituent group of similar polarity to the polymer material used in an ultimate composite.
- the term "compatibility with a thermoplastic polymer” can be characterized by differential scanning calorimetry (DSC) data and by measuring surface energy using a goniometer device.
- DSC differential scanning calorimetry
- the calorimetry of a separate polymer phase and a modified cellulose phase or the cellulose modifier reagent can be measured with DSC equipment. After the materials are mixed, compatibility can be shown in a DSC scan by showing differences in the T g peaks.
- Compatible materials have modified T g 's, fully compatible materials will form a single T g peak in the scan.
- measuring the surface energy of the materials using a goniometer will produce a surface energy quantity. Similar quantities will suggest compatibility.
- the polymer compatible functional group on the cellulose naturally associates with the polymer using van der Waals' forces causing an increased compatibility, mixing or wetting of the polymer with the fiber.
- both the polymer and the cellulosic material can be derivatized with functional groups that increase the polymer fiber compatibility.
- the functional groups can have moieties on the functional group that are compatible with the corresponding moiety.
- the increased compatibility of polymer and fiber after modification can be obtained by measuring the DSC properties or surface energy of the modified polymer/fiber, the polymer/modified fiber or the modified polymer/modified fiber when compared to the polymer/fiber material alone. Such materials with increased compatibility have improved thermodynamic properties and reduced energy of mixing.
- the resulting modified materials remain completely thermoplastic because they are substantially free of any substantial crosslinking of fiber-to-fiber or polymer-to-fiber.
- the material once manufactured can be extruded in the form of a thermoplastic pellet which can then be subject to heat and pressure and molded using either extrusion technology or thermoforming technology into window and door structural members.
- the wood fiber preferably comprises sawdust or milling byproduct waste stream from milling wooden members in window manufacture and can be contaminated with substantial proportions of hot melt adhesive, paint, solvent or adhesive components, preservatives, polyvinyl chloride recycle pigment, plasticizers, etc.
- the PVC and wood fiber composite can be manufactured into acceptable substitutes for wooden members if the PVC and wood material contains less than about 10 wt-%, preferably less than 3.5% water based on pellet weight. Water is removed by degassing (removing water vapor) during melt processing of the composite.
- the compositions can achieve, in a final product, high modulus, improved creep resistance, improved heat distortion temperature, high compressive strength, reproducible, stable dimensions, a superior modulus and elasticity.
- We have also found that the successful manufacture of structural members for windows and doors requires the preliminary manufacture of the polyvinyl chloride wood fiber composite in the form of a pellet wherein the materials are intimately mixed and contacted in forming the pellet prior to the extrusion of the members from the pellet material.
- the materials of the invention are free of an effective quantity of a plasticizer. Such materials can only reduce the uilimate mechanical stregnth of the material. Further the material is formulated with proportions of materials that remain fully thermoplastic and recyclable in normal melt processing.
- the invention relates to the use of a modified polyvinyl chloride, a modified wood fiber or both, in a composite material.
- the preferred material has a controlled water content.
- the material is preferably made in the form of a pelletized compatible material wherein the wood fiber is intimately contacted and wetted by the organic materials due to increased compatibility. The intimate contact and wetting between the components in the pelletizing process ensures high quality physical properties in the extruded composite materials after manufacture.
- the preferred material is a polymer comprising vinyl chloride.
- a modified polymer as defined below, can be used with modified or unmodified cellulose. Unmodified polymer can be used only with a modified adhesive fiber.
- Polyvinyl chloride is a common commodity thermoplastic polymer.
- Vinyl chloride monomer is made from a variety of different processes such as the reaction of acetylene and hydrogen chloride and the direct chlorination of ethylene.
- Polyvinyl chloride is typically manufactured by the free radical polymerization of vinyl chloride resulting in a useful thermoplastic polymer. After polymerization, polyvinyl chloride is commonly combined with thermal stabilizers, lubricants, plasticizers, organic and inorganic pigments, fillers, biocides, processing aids, flame retardants and other commonly available additive materials.
- Polyvinyl chloride can also be combined with other vinyl monomers in the manufacture of polyvinyl chloride copolymers.
- Such copolymers can be linear copolymers, branched copolymers, graft copolymers, random copolymers, regular repeating copolymers, heteric copolymers and block copolymers, etc.
- Monomers that can be combined with vinyl chloride to form vinyl chloride copolymers include a acrylonitrile; alpha-olefins such as ethylene, propylene, etc.; chlorinated monomers such as vinylidene dichloride, acrylate monomers such as acrylic acid, methylacrylate, methylmethacrylate, acrylamide, hydroxyethyl acrylate, and others; styrenic monomers such as styrene, alphamethyl styrene, vinyl toluene, etc.; vinyl acetate; and other commonly available ethylenically unsaturated monomer compositions.
- Such monomers can be used in an amount of up to but less than about 50 mol-%, the balance being vinyl chloride.
- Polymer blends or polymer alloys can also be useful in manufacturing the pellet or linear extrudate of the invention. Such alloys typically comprise two miscible polymers blended to form a uniform composition. Scientific and commercial progress in the area of polymer blends has lead to the realization that important physical property improvements can be made not by developing new polymer material but by forming miscible polymer blends or alloys.
- a polymer alloy at equilibrium comprises a mixture of two amorphous polymers existing as a single phase of intimately mixed segments of the two macro molecular components.
- Miscible amorphous polymers form glasses upon sufficient cooling and a homogeneous or miscible polymer blend exhibits a single, composition dependent glass transition temperature (T g ).
- Immiscible or non-alloyed blend of polymers typically displays two or more glass transition temperatures associated with immiscible polymer phases.
- the properties of polymer alloys reflect a composition weighted average of properties possessed by the components. In general, however, the property dependence on composition varies in a complex way with a particular property, the nature of the components (glassy, rubbery or semi-crystalline), the thermodynamic state of the blend, and its mechanical state whether molecules and phases are oriented.
- Polyvinyl chloride forms a number of known polymer alloys including, for example, polyvinyl chloride/nitrile rubber; polyvinyl chloride and related chlorinated copolymers and terpolymers of polyvinyl chloride or vinylidene dichloride; polyvinyl chloride/alphamethyl styrene-acrylonitrile copolymer blends; polyvinyl chloride/polyethylene; polyvinyl chloride/chlorinated polyethylene and others.
- the primary requirement for the substantially thermoplastic polymeric material is that it retain sufficient thermoplastic properties to permit melt blending with wood fiber, permit formation of linear extrudate pellets, and to permit the composition material or pellet to be extruded or injection molded in a thermoplastic process forming the rigid structural member.
- Polyvinyl chloride homopolymers copolymers and polymer alloys are available from a number of manufacturers including B.F. Goodrich, Vista, Air Products, Occidental Chemicals, etc.
- Preferred polyvinyl chloride materials are polyvinyl chloride homopolymer having a molecular weight (Mn) of about 90,000 ⁇ 50,000, most preferably about 88,000 ⁇ 10,000.
- the polyvinyl chloride material is modified to introduce pendant groups that can form hydrogen bonds with the cellulosic hydroxyl groups.
- Cellulose molecules are known to be polymers of glucose with varying branching and molecular weight. Glucose molecules contain both secondary and primary hydroxyl groups and many such groups are available for hydrogen bonding.
- the modified polyvinyl chloride comprises either a polymer comprising vinyl chloride and a second monomer having functional groups that are capable of forming hydrogen bonds with cellulose. Further, the modified polymer can comprise a polymer comprising vinyl chloride and optionally a second monomer that is reacted with the modifying reagent that can form substituents having hydrogen bonding functional groups.
- the polyvinyl chloride polymer material can be modified either by grafting onto the polymer backbone a reactive moiety compatible with the cellulose or by incorporating into the polymer backbone, by copolymerization techniques, functional groups that can increase polymer compatibility. It should be clearly understood that the PVC cellulosic fiber compatibility is relatively good. Wood fiber and polyvinyl chloride polymer will mix under conditions achievable in modern extrusion equipment. However, the compatibility of long chain modifications to the cellulosic polymer material provides significantly enhanced tensile strength.
- monomers that can be included as a minor component (less than 50 mol-%) in a polyvinyl chloride copolymer include vinyl alcohol (hydrolyzed polyvinyl acetate monomer), maleic anhydride monomer, glycidyl methacrylate, vinyl oxazolines, vinyl pyrrolidones, vinyl lactones, and others.
- Such monomers when present at the preferred concentration (less than 10 mol-%, preferably less than 5 mol-%) react covalently with cellulose hydroxyl groups and form associative bonds with cellulosic hydroxyl groups resulting in increased compatibility but are not sufficiently reacted to result in a crosslinked material.
- the polyvinyl chloride polymer material can be grafted with a variety of reactive compositions.
- the reactive species has a primary or secondary nitrogen, an oxygen atom, or a carboxyl group that can both covalently bond (to a small degree) and form hydroxyl groups with cellulosic materials.
- Included within the useful reactive species are N-vinyl pyrrolidone, N-vinyl pyridine, N-vinyl pyrimidine, polyvinyl alcohol polymers, unsaturated fatty acids, acrylic acid, methacrylic acid, reactive acrylic oligomers, reactive amines, reactive amides and others.
- Virtually any reactive or grafting species containing a hydrogen bonding atom can be used as a graft reagent for the purposes of this invention.
- Wood fiber in terms of abundance and suitability can be derived from either soft woods or evergreens or from hard woods commonly known as broad leaf deciduous trees. Soft woods are generally preferred for fiber manufacture because the resulting fibers are longer, contain high percentages of lignin and lower percentages of hemicellulose than hard woods. While soft wood is the primary source of fiber for the invention, additional fiber make-up can be derived from a number of secondary or fiber reclaim sources including bamboo, rice, sugar cane, and recycled fibers from newspapers, boxes, computer printouts, etc.
- the primary source for wood fiber of this invention comprises the wood fiber by-product of sawing or milling soft woods commonly known as sawdust or milling tailings.
- Such wood fiber has a regular reproducible shape and aspect ratio.
- the fibers based on a random selection of about 100 fibers are commonly at least 3 mm in length, 1 mm in thickness and commonly have an aspect ratio of at least 1.8.
- the fibers are 1 to 10 mm in length, 0.3 to 1.5 mm in thickness with an aspect ratio between 2 and 7, preferably 2.5 to 6.0.
- the preferred fiber for use in this invention are fibers derived from processes common in the manufacture of windows and doors. Wooden members are commonly ripped or sawed to size in a cross grain direction to form appropriate lengths and widths of wood materials.
- the by-product of such sawing operations is a substantial quantity of sawdust.
- wood is commonly passed through machines which selectively removes wood from the piece leaving the useful shape.
- Such milling operations produces substantial quantities of sawdust or mill tailing by-products.
- substantial waste trim is produced.
- Such large trim pieces are commonly cut and machined to convert the larger objects into wood fiber having dimensions approximating sawdust or mill tailing dimensions.
- the wood fiber sources of the invention can be blended regardless of particle size and used to make the composite.
- the fiber stream can be pre-sized to a preferred range or can be sized after blending. Further, the fiber can be pre-pelletized before use in composite manufacture.
- Such sawdust material can contain substantial proportions of waste stream by-products.
- waste polyvinyl chloride or other polymer materials that have been used as coating, cladding or envelope on wooden members; recycled structural members made from thermoplastic materials; polymeric materials from coatings; adhesive components in the form of hot melt adhesives, solvent based adhesives, powdered adhesives, etc.; paints including water based paints, alkyd paints, epoxy paints, etc.; preservatives, anti-fungal agents, anti-bacterial agents, insecticides, etc., and other waste streams common in the manufacture of wooden doors and windows.
- the total waste stream content of the wood fiber materials is commonly less than 25 wt-% of the total wood fiber input into the polyvinyl chloride wood fiber product.
- the intentional recycle ranges from about 1 to about 25 wt-%, preferably about 2 to about 20 wt-%, most commonly from about 3 to about 15 wt-% of contaminants based on the sawdust.
- the chemical modifier comprises long chain groups that can entangle or associate with the polymer to increase compoatability. Such chains are typically polymeric but can also be long (C 6-36 ) aklyl groups.
- compatible polymeric species that can associate with polyvinyl chloride polymers in improving compatibility can be found using either differential scanning calorimetry or surface energy (goniometer) data.
- Examples of compatible polymer species that can be grafted onto a cellulosic molecule for increasing compatibility include acrylonitrile butadiene styrene polymers, maleic anhydride butadiene styrene polymers, chlorinated polyethylene polymers, styrene acrylonitrile polymers, alpha styrene acrylonitrile polymers, polymethyl methacrylate polymers, ethylene vinyl acetate polymers, natural rubber polymers, a variety of thermoplastic polyurethane polymers, styrene maleic anhydride polymers, synthetic rubber elastomers, polyacrylicimide polymers, polyacrylamide polymers, polycaprolactone polymers, poly(ethylene-adipate).
- Such polymeric groups can be reacted with other reactive species to form on the polymeric backbone a group reactive with a cellulosic hydroxyl group to result in a modified cellulose material.
- Such functional groups include carboxylic anhydrides, epoxides (oxirane), carboxylic acids, carboxylic acid chlorides, isocyanate, lactone, alkyl chloride, nitrile, oxazoline, azide, etc.
- the polyvinyl chloride and wood fiber can be combined and formed into a pellet using a thermoplastic extrusion processes.
- Wood fiber, modified or unmodified, can be introduced into pellet making process in a number of sizes. We believe that the wood fiber should have a minimum size of length and width of at least 1 mm because wood flour tends to be explosive at certain wood to air ratios. Further, wood fiber of appropriate size of a aspect ratio greater than 1 tends to increase the physical properties of the extruded structural member.
- useful structural members can be made with a fiber of very large size. Fibers that are up to 3 cm in length and 0.5 cm in thickness can be used as input to the pellet or linear extrudate manufacturing process. However, particles of this size do not produce highest quality structural members or maximized structural strength.
- the best appearing product with maximized structural properties are manufactured within a range of particle size as set forth below.
- large particle wood fiber an be reduced in size by grinding or other similar processes that produce a fiber similar to sawdust having the stated dimensions and aspect ratio.
- One further advantage of manufacturing sawdust of the desired size is that the material can be pre-dried before introduction into the pellet or linear extrudate manufacturing process. Further, the wood fiber can be pre-pelletized into pellets of wood fiber with small amounts of binder if necessary.
- the polyvinyl chloride in an appropriate modification if modified and wood fiber are intimately contacted at high temperatures and pressures to insure that the wood fiber and polymeric material are wetted, mixed and extruded in a form such that the polymer material, on a microscopic basis, coats and flows into the pores, cavity, etc., of the fibers.
- the fibers are preferably substantially oriented by the extrusion process in the extrusion direction. Such substantial orientation causes overlapping of adjacent parallel fibers and polymeric coating of the oriented fibers resulting a material useful for manufacture of improved structural members with improved physical properties.
- the degree of orientation is about 20%, preferably 30% above random orientation which is about 45 to 50%.
- the structural members have substantially increased strength and tensile modulus with a coefficient of thermal expansion and a modulus of elasticity that is optimized for window and doors. The properties are a useful compromise between wood, aluminum and neat polymer.
- Moisture control is an important element of manufacturing a useful linear extrudate or pellet.
- control of the water content of the linear extrudate or pellet can be important in forming a successful structural member substantially free of internal voids or surface blemishes.
- the concentration of water present in the sawdust during the formation of pellet or linear extrudate when heated can flash from the surface of the newly extruded structural member and can come as a result of a rapid volatilization, form a steam bubble deep in the interior of the extruded member which can pass from the interior through the hot thermoplastic extrudate leaving a substantial flaw.
- surface water can bubble and leave cracks, bubbles or other surface flaws in the extruded member.
- Trees when cut depending on relative humidity and season can contain from 30 to 300 wt-% water based on fiber content.
- seasoned wood can have a water content of from 20 to 30 wt-% based on fiber content.
- Kiln dried sized lumber cut to length can have a water content typically in the range of 8 to 12%, commonly 8 to 10 wt-% based on fiber.
- Some wood source, such as poplar or aspen, can have increased moisture content while some hard woods can have reduced water content.
- the pellet should be as dry as possible and have a water content between 0.01 and 5%, preferably less than 3.5 wt-%.
- a water content of less than 8 wt-% can be tolerated if processing conditions are such that vented extrusion equipment can dry the thermoplastic material prior to the final formation of the structural member of the extrusion head.
- the pellets or linear extrudate of the invention are made by extrusion of the polyvinyl chloride and wood fiber composite through an extrusion die resulting in a linear extrudate that can be cut into a pellet shape.
- the pellet cross-section can be any arbitrary shape depending on the extrusion die geometry. However, we have found that a regular geometric cross-sectional shape can be useful. Such regular cross-sectional shapes include a triangle, a square, a rectangle, a hexagonal, an oval, a circle, etc.
- the preferred shape of the pellet is a regular cylinder having a roughly circular or somewhat oval cross-section.
- the pellet volume is preferably greater than about 12 mm 3 .
- the preferred pellet is a right circular cylinder, the preferred radius of the cylinder is at least 1.5 mm with a length of at least 1 mm.
- the pellet has a radius of 1 to 5 mm and a length of 1 to 10 mm.
- the cylinder has a radius of 2.3 to 2.6 mm, a length of 2.4 to 4.7 mm, a volume of 40 to 100 mm 3 , a weight of 40 to 130 mg and a bulk density of about 0.2 to 0.8 gm/mm 3 .
- thermoplastic material comprises an exterior continuous organic polymer phase with the wood particle dispersed as a discontinuous phase in the continuous polymer phase.
- the material during mixing and extrusion obtains an aspect ratio of at least 1.1 and preferably between 2 and 4, optimizes orientation such as at least 20 wt-%, preferably 30% of the fibers are oriented in an extruder direction and are thoroughly mixed and wetted by the polymer such that all exterior surfaces of the wood fiber are in contact with the polymer material.
- orientation such as at least 20 wt-%, preferably 30% of the fibers are oriented in an extruder direction and are thoroughly mixed and wetted by the polymer such that all exterior surfaces of the wood fiber are in contact with the polymer material.
- This means, that any pore, crevice, crack, passage way, indentation, etc., is fully filled by thermoplastic material.
- Such penetration as attained by ensuring that the viscosity of the polymer melt is reduced by operations at elevated temperature and the use of sufficient pressure to force the polymer into the available internal pores, cracks and crevices in and on the surface of the wood fiber.
- pellet dimensions are selected for both convenience in manufacturing and in optimizing the final properties of the extruded materials.
- a pellet is with dimensions substantially less than the dimensions set forth above are difficult to extrude, pelletize and handle in storage.
- Pellets larger than the range recited are difficult to introduce into extrusion or injection molding equipment, and are different to melt and form into a finished structural member.
- the manufacture and procedure requires two important steps. A first blending step and a second pelletizing step.
- the polymer and wood fiber are intimately mixed by high shear mixing components with recycled material to form a polymer wood composite wherein the polymer mixture comprises a continuous organic phase and the wood fiber with the recycled materials forms a discontinuous phase suspended or dispersed throughout the polymer phase.
- the manufacture of the dispersed fiber phase within a continuous polymer phase requires substantial mechanical input. Such input can be achieved using a variety of mixing means including preferably extruder mechanisms wherein the materials are mixed under conditions of high shear until the appropriate degree of wetting and intimate contact is achieved. After the materials are fully mixed, the moisture content can be controlled at a moisture removal station.
- the heated composite is exposed to atmospheric pressure or reduced pressure at elevated temperature for a sufficient period of time to remove moisture resulting in a final moisture content of about 8 wt-% or less.
- the polymer fiber is aligned and extruded into a useful form.
- the preferred equipment for mixing and extruding the composition and wood pellet of the invention is an industrial extruder device.
- extruders can be obtained from a variety of manufacturers including Cincinnati Millicron, etc.
- the materials feed to the extruder can comprise from about 30 to 50 wt-% of sawdust including recycled impurity along with from about 50 to 70 wt-% of polyvinyl chloride polymer compositions.
- the polyvinyl chloride feed is commonly in a small particulate size which can take the form of flake, pellet, powder, etc. Any polymer form can be used such that the polymer can be dry mixed with the sawdust to result in a substantially uniform pre-mix.
- the wood fiber or sawdust input can be derived from a number of plant locations including the sawdust resulting from rip or cross grain sawing, milling of wood products or the intentional commuting or fiber manufacture from waste wood scrap. Such materials can be used directly from the operations resulting in the wood fiber by-product or the by-products can be blended to form a blended product. Further, any wood fiber material alone, or in combination with other wood fiber materials, can be blended with waste stream by-product from the manufacturer of wood windows as discussed above. The wood fiber or sawdust can be combined with other fibers and recycled in commonly available particulate handling equipment.
- Polymer and wood fiber are then dry blended in appropriate proportions prior to introduction into blending equipment.
- Such blending steps can occur in separate powder handling equipment or the polymer fiber streams can be simultaneously introduced into the mixing station at appropriate feed ratios to ensure appropriate product composition.
- the wood fiber is placed in a hopper, controlled by weight or by volume, to meter the sawdust at a desired volume while the polymer is introduced into a similar hopper have a gravametric metering input system.
- the weights are adjusted to ensure that the composite material contains appropriate proportions on a weight basis of polymer and wood fiber.
- the fibers are introduced into a twin screw extrusion device.
- the extrusion device has a mixing section, a transport section and melt section. Each section has a desired heat profile resulting in a useful product.
- the materials are introduced into the extruder at a rate of about 600 to about 4000 pounds of material per hour and are initially heated to a temperature of about 215°-225° C.
- the stage In the intake section, the stage is maintained at about 215° C. to 225° C.
- the temperature of the twin screw mixing stage is staged beginning at a temperature of about 205°-215° C. leading to a final temperature in the melt section of about 195°-205° C. at spaced stages.
- the material Once the material leaves the blending stage, it is introduced into a three stage extruder with a temperature in the initial section of 185°-195° C. wherein the mixed thermoplastic stream is divided into a number of cylindrical streams through a head section and extruded in a final zone of 195°-200° C.
- Such head sections can contain a circular distribution (6-8" diameter) of 10 to 500 or more, preferably 20 to 250 orifices having a cross-sectional shape leading to the production of a regular cylindrical pellet.
- a circular distribution (6-8" diameter) of 10 to 500 or more, preferably 20 to 250 orifices having a cross-sectional shape leading to the production of a regular cylindrical pellet.
- the following information illustrates the typical production conditions and compositions and the tensile modulus of a structural member made from the pellet.
- the following examples and data contain a best mode.
- the input to the pelletizer comprised approximately 60 wt-% polymer and 40 wt-% sawdust.
- the polymer material comprises a thermoplastic mixture of approximately 100 parts of polyvinyl chloride homopolymer (in. weight of 88,000 ⁇ 2000), about 15 parts titanium dioxide, about 2 parts ethylene bis-stearamide wax lubricant, about 1.5 parts calcium stearate, about 7.5 parts Rohm & Haas 980 T acrylic resin impact modifier/process aid and about 2 parts of dimethyl tin thioglycolate.
- the sawdust comprises a wood fiber particle containing about 5 wt-% recycled polyvinyl chloride having a composition substantially identical to that recited above.
- the initial melt temperature in the extruder was maintained between 180° C. and 210° C.
- the pelletizer was operated at a polyvinyl chloride-sawdust composite combined through put of 800 pounds per hour.
- the barrel temperature was maintained between 215°-225° C.
- the intake zone the barrel was maintained at 215°-225° C.
- the compression zone the temperature was maintained at between 205°-215° C.
- the temperature was maintained at 195°-205° C.
- the die was divided into three zones, the first zone at 185°-195° C., the second die zone at 185°-195° C. and in the final die zone at 195°-205° C.
- the pelletizing head was operated at a setting providing 100 to 300 rpm resulting in a pellet with a diameter of 5 mm and a length of about 1-10 mm.
- VERR40 is a terpolymer of Vinylchloride-vinylacetate-glycidyl methacrylate (82%-9%-9%) with an epoxy functionality of 1.8% by weight
- Epoxy used was Dows' DER332 which is a Diglycidyl bisphenol A epoxy
- Catalyst used was Triethylene amine from Aldrich Chemical Company
- ATBN rubber used was Goodrich's "HYCAR 1300X45” which is an "amine terminated butadiene acrylonitrile copolymer"
- the SMA was Dylark 332 from ARCO chemical contains 14-15% maleic anhydride and molecular weight of approximately 170,000
- SMA was either 0, or 10 parts
- PVC varied inversely with the sawdust 100, 90, 75, 60, or 50 parts such that the PVC and saw dust parts added up to 100 parts
- the formulations were fed into a twin screw counter rotating extruder and extruded as a 1" ⁇ 0.1" strip.
- Strips from #6 above were ground into pellets with a Cumberland grinder and fed into the twin screw extruder for a second time.
- the Vinyl Chloride Vinyl Acetate glycidyl methacrylate (82%-9%-9% by mole) was UCAR VERR-40 from Union Carbide Chemicals and Plastics contains 9% glycidyl methacrylate and comes as a 40% solution in toluene and methyl ethyl ketone.
- VERR-40 was either 0, 4, or 10 parts of the PVC compound based on the weight of the solids.
- Sawdust was 0 or 40 parts PVC+the VERR-40 varied inversely with the sawdust 100, or 60, parts such that the PVC+VERR-40 and sawdust parts added up to 100 parts.
- the VERR-40 was diluted with an additional 50 ml acetone and added to the sawdust first and mixed to provide even dispersion of VERR-40 on the sawdust.
- the formulations were fed into a twin screw counter rotating extruder and extruded as a 1" ⁇ 0.1" strip.
- Fusion bowl data confirm the covalent reaction between wood fiber and SMA #1 resin. An increase in the equilibrium torque shows substantial reaction. In case 1, no fiber is used. In case 2, fiber is combined with no reactive resin and polystyrene a nonreactive resin. The equilibrium torque in the presence of fiber and substantial quantities of reactive SMA resin shows a 52% increase. Similar data is shown in case 3 using fiber and a styrene maleic anhydride modifier material.
- modified polyvinyl chloride polymer can also improve physical properties of the composite material. Further, the data shows the thermoplastic nature of the modified material.
- the modified material can be formed in a modified state, ground and reprocessed under thermoplastic conditions with no substantial change in physical properties.
- Fusion bowl is a Brabender mixer of the type 6 with roller blades.
- the mixer was heated to 185° C.
- a charge of 62 grams was fed into the mixer with the blades rotating at 65 rpm.
- Automatic data acquisition software facilitated continuous recording of torque and material temperature. Any chemical interaction such as bonding between the compatibilizer and the sawdust results in an increase in the torque. Too much reaction would increase the torque and thus the temperature to an extent that PVC degrades. PVC degradation shows up as discoloration to black and also HCL fumes.
- the fusion bowl can be used to monitor reactions between various ingredients.
- the following data table shows the presence of the terpolymer improves tensile stress with no substantial loss in modulus.
- the material is terpolymer as above coupled with the rubber and polymer with and epoxy diamine HYCAR1300X45 terminated butadiene acrylonitrile rubber component HYCAR1300X45.
- the use of the rubber containing chemical modifier substantially increases the impact strength.
- Pass 1 shows that the modified material has a similar tensile stress elongation and modulus as the other materials in the table.
- Pass 2 is a second extrusion of the material of pass 1. The physical properties are not different significantly showing substantial thermoplastic character.
Abstract
Description
______________________________________ Composition (parts by weight) Run number PVC compound saw dust SMA ______________________________________ 1 100 0 0 2 100 0 10 3 90 10 0 4 90 10 10 5 75 25 0 6 75 25 10 7 60 40 0 8 60 40 10 9 50 50 0 10 50 50 10 ______________________________________ *In the following work the modifier is referred to by these numbers.
TABLE 1 ______________________________________ Composition (parts by weight) Tensile Properties Run PVC % strain @ number compound saw dust SMA Modulus max load stress ______________________________________ 1 100 0 0 536,533 2.772 2 100 0 10 494,010 2.535 3 90 10 0 579,925 2.746 4 90 10 10 573,448 2.452 5 75 25 0 829,455 1.819 6 75 25 10 844,015 1.548 7 60 40 0 1,112,819 1.145 8 60 40 10 1,039,749 1.168 9 50 50 0 1,254,213 0.843 10 50 50 10 1,174,936 0.965 ______________________________________ These data show the chemical modification has no significant impact on modulus, but has a significant increase in both % strain and in stress values.
______________________________________ PVC WF SMA % Retain ______________________________________ NNC3 2% M.C. -- 38.83 NNC3 2% M.C. 332-10% 43.88 NNC3 wet, 40% -- 41.21 NNC3 wet, 40% 332-10% 47.25 NNC3 wet, 40% Butadiene-Man 48.39 NNC3 0 SMA332 30.61 ______________________________________ These data show that the SMA reacts with and is bonded to the wood fiber to increase compatability.
______________________________________ Composition (parts by weight) Run number PVC compound saw dust VERR-40 ______________________________________ 1 100 0 0 2 96 0 4 3 90 0 10 4 60 40 0 5 57.6 40 2.4 6 54 40 6 ______________________________________
______________________________________ Run Composition (parts by weight) Tensile Properties num- PVC saw % strain @ ber compound dust VERR-40 Modulus max load stress ______________________________________ 1 100 0 0 501,236 3.301 8458.6 2 96 0 4 488,245 2.741 7493.7 3 90 0 10 459,835 2.951 6833 4 60 40 0 1,143,393 0.949 6384.5 5 57.6 40 2.4 1,230,761 0.961 6688.9 6 54 40 6 1,273,530 0.889 6969.3 ______________________________________ These data show significant improvement in stress with no substantial los in modulus.
______________________________________ Composite with Percent 40% sawdust resin retain ______________________________________ 10% VERR-40 5.6 4% VERR-40 2.6 10% SMA #1 7.4 Control 1.0 ______________________________________
______________________________________ Compound: PVC, TM181 1 phr*, calcium stearate 1.5 phr, oxidized polyethylene, 0.8 phr, Paraffin 0.8 phr % Additive AWF Eq. Tqe Increase ______________________________________ Case 1 -- -- 2135 0.00 (1) 10% SMA 332 -- 2182 2.20 10% PS -- 1598 -25.15 Case 2 -- 40% Dried 1795 0.00 (1) 10% SMA 332 40% Dried 2730 52.09 10% PS 40% Dried 1891 5.35 Case 3 -- 40% Dried 1883 0.00 (1) 10% SMA 332 40% Dried 3799 101.75 (3) 10% PolySci 40% Dried 3926 108.50 SMA ______________________________________ *phr = parts per hundred parts resin
______________________________________ (3) Terpolymer Modulus Elongation Stress ______________________________________ 0 1045094 1.173 5896 3 1056674 1.054 6637 5 1046822 1.121 6351 8 1027874 1.155 6452 10 1047205 1.096 6715 0 1047415 1.121 6206 3 1039648 1.034 6421 5 1069781 1.037 6909 8 1052043 1.056 7237 ______________________________________
______________________________________ Impact Terpolymer Epoxy TEA strength ______________________________________ 6 5.64 0 8.0/0.6 6 5.64 15 (6) 1% ATBN, applied to sawdust 6 5.64 0 6 5.64 15 10.4/0.4 ______________________________________
______________________________________ Tensile Terpolymer Epoxy TEA Modulus Elongation Stress ______________________________________ 0 0 0 1033518 1.08 5826 0 0 0 1036756 1.056 5889 5 0 0 1045985 1.049 6325 Pass 1 3 15 1073853 0.98 7001 Pass 2 3 15 1098495 1.007 7150 5 ______________________________________
______________________________________ (3) (4) (5) Elongation Stress Terpolymer Epoxy TEA Modulus at max load max load ______________________________________ 0 0 0 1048353 1.114 5990 0 0 15 1059081 1.032 6233 0 4 -- 994857 1.07 5735 0 4 15% 1089991 0.997 6500 6 0 -- 1059950 1.084 6610 6 0 15% 1054579 1.04 6895 3 3 -- 1104357 1.059 6174 3 3 15% 1142600 0.988 6701 5 3 -- 1092483 0.998 6299 5 3 15% 1106976 0.979 6952 8 3 -- 1104892 1.005 6438 8 3 15% 1126601 0.988 7093 8 5 -- 1288699 0.908 6497 8 5 15% 1111775 0.907 7123 5 5 -- 1137586 0.963 6383 5 5 15% 1115420 0.923 7105 3 5 -- 1110601 0.972 6163 3 5 15% ______________________________________
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